lm386n datasheet
a measurement between pins 3 and 4 should show the input voltage. And between pins 6 and 4, the power supply voltage as measured AT the IC If you are able, I'd input a 0.1 VDC signal into the input, then measure the output. the ncie thing about this amp is that you can input use a unipolar supply and still input negative input voltages .for instance .audio signals . well technically, since you're using a 9V battery for power, that would be half the supply 4.5V plus the multiplied input .1V x 20 2V or 6.5V Now .here's where things get a bit iffy. Having said that, my suspicion is that since the supply is unipolar 5V and GND, 10V and GND, etc , you need a bypass cap on the output to block the DC component noted above and in the datasheet.
lm386n datasheet
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